2-D MHD turbulence in the vicinity of the plasmapause?

Details 2-D MHD turbulence in the vicinity of the plasmapause? 2-D MHD turbulence in the vicinity of the plasmapause?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0822m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0822

Computer Science

Sound

2752 Mhd Waves And Instabilities, 2768 Plasmasphere

Scientific paper

The CLUSTER quartet crosses the plasmasphere once per orbit when the geomagnetic activity is not too high. In this case, the plasmasphere may shrink to altitudes below L=4. The plasmapause, the boundary between the plasmasphere and the magnetosphere, is often considered to correspond to a step-like density drop out (around 1000 e-/cc in the plasmasphere and 1 e-/cc outside), which fits to the image of a dense and smooth electron density "doughnut" around the Earth. But, as observed by CLUSTER, the reality is more complex: large density fluctuations are observed inside the plasmasphere or at the plasmapause. We have analyzed these large fluctuations on the Spacecraft Potential, considered as a proxy of the electron density, measured by the Electric Field and Waves instrument. The WHISPER relaxation sounder is used for calibration below 100 e-/cc. A companion presentation on this subject will be made by O. Moullard. We check for the presence of 2-D MHD turbulence. Such turbulence could be produced by velocity shear at the flow separatrix, which can be detected using the electric field data. As a unique feature of CLUSTER, the use of the four satellites facility allows to investigate the spatial extension and the temporal evolution of this turbulence. Finally, the relation between these large amplitude fluctuations and low frequency emissions observed by STAFF are investigated.

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